package com.hmdp.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.data.redis.support.collections.DefaultRedisList;
import org.yaml.snakeyaml.events.Event;

import java.util.Collection;
import java.util.Collections;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

public class SimpleRedisLock implements ILock{

    private String name;
    private StringRedisTemplate stringRedisTemplate;

    public SimpleRedisLock(String name, StringRedisTemplate stringRedisTemplate) {
        this.name = name;
        this.stringRedisTemplate = stringRedisTemplate;
    }

    private static final String KEY_PREFIX = "lock:";
    private static final String ID_PREFIX = UUID.randomUUID().toString() + "-";

    private static final DefaultRedisScript<Long> UNLOCK_SCRIPT;

    static {
        UNLOCK_SCRIPT = new DefaultRedisScript<>();
        UNLOCK_SCRIPT.setLocation(new ClassPathResource("unlock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
    }
    @Override
    public boolean tryLock(long timeoutSec) {
        //获取线程标识
        String threadId = ID_PREFIX + Thread.currentThread().getId();

        //获取锁
        Boolean success = stringRedisTemplate.opsForValue().setIfAbsent(
                KEY_PREFIX + name, threadId, timeoutSec, TimeUnit.SECONDS);


        return Boolean.TRUE.equals(success);
    }

    public void unlock(){
        // 调用lua脚本
        stringRedisTemplate.execute(
                UNLOCK_SCRIPT,
                Collections.singletonList(KEY_PREFIX + name),
                ID_PREFIX + Thread.currentThread().getId()
                );
    }
//    @Override
//    public void unlock() {
//        // 获取线程标识
//        String threadId = ID_PREFIX + Thread.currentThread().getId();
//        // 获取锁中标识
//        String id = stringRedisTemplate.opsForValue().get(KEY_PREFIX + name);
//        // 判断标识是否一致
//        if (threadId.equals(id)){
//            //释放锁
//            stringRedisTemplate.delete(KEY_PREFIX + name);
//        }
//    }
}
